Gadenin日本語Get the appEvenly moist, which is narrower than it sounds
Coffee is less forgiving of drought than most houseplants and less forgiving of standing water than almost any of them. It sits in a narrow band: compost that stays lightly damp all the way through, with air still in it. Let the pot go bone dry once and you get a rapid wilt, then a rim of crisp brown along the leaf edges within days. Let it sit in water and the roots suffocate, and the first sign you get is leaves yellowing and dropping from the bottom, which people read as thirst and treat with more water.
That confusion is the reason most coffee plants are lost. Overwatered and underwatered plants both drop leaves and both look limp. The difference is in the pot, not the leaves: put a finger in and check before you reach for the watering can, every single time, until the plant's rhythm is familiar to you.
| What you see | Too dry | Too wet |
|---|---|---|
| Wilting | Sudden, whole plant, recovers in hours after watering | Gradual, does not recover after watering |
| Leaf color | Crisp brown edges, leaf otherwise green | Whole leaves turn yellow, starting at the bottom |
| Compost | Pale, pulling away from the pot wall, light to lift | Dark and heavy days after watering, sour smell |
| Leaf drop | Dry leaves that crumble | Soft leaves that come off with a touch |
A wilted coffee plant that has been watered stands back up within four to six hours. If it is still limp the next morning, the problem was never thirst. Turn it out of the pot and look at the roots.
How to check, and how to water
There is no interval in days that works, because a pot's drying speed depends on its size, its material, the room temperature and the light far more than on the plant. The right habit is checking twice a week and watering only when the check says so. In a plastic pot of about eight inches (20 cm) in a warm bright room that usually turns out to be every five to seven days in summer, but let that be a result rather than a rule.
- Feel the top inch Push a finger in to the first knuckle. Dry there and the plant is ready. If it is still cool and damp, wait two days and check again. Coffee likes to be watered slightly sooner than most houseplants, so do not wait for it to dry halfway down the pot.
- Lift the pot Learn what it weighs immediately after a full watering. The weight drop is the most reliable signal there is, and it works on a pot too large to get a finger properly into.
- Water until it runs out of the bottom Pour slowly and evenly over the whole surface, not down one side, and keep going until water runs freely from the drainage holes. A splash that wets only the top inch leaves the root ball dry in the middle, and repeating that is how plants die of thirst in wet compost.
- Empty the saucer within half an hour Water left standing keeps the bottom of the root ball saturated. This one habit prevents most cases of root rot, and it matters most in winter when the pot is drying slowly anyway.
- Use tepid water Cold water straight from the tap shocks tropical roots and briefly stops them absorbing. Let it stand in the can until it is at room temperature. Coffee prefers slightly acidic water, so if you have very hard tap water, collected rainwater is a genuine improvement.
The seasons change the interval, not the amount
In winter a coffee plant in a room at 60 to 65F (15 to 18C) is barely growing and uses a fraction of the water it did at the height of summer. The compost can stay damp for two or three weeks. Keep to a summer routine through the winter and you will rot the roots, which is the commonest way of losing a plant that has been thriving all year.
The rule is to stretch the gap between waterings and keep the volume the same. Half a can more often is worse than a full drenching less often, because it wets only the surface and leaves salts behind in the middle of the pot.
| Season | Typical interval | Notes |
|---|---|---|
| Spring | Every five to eight days | Growth restarts. Start feeding again |
| Summer | Every three to six days | Daily checks if it is standing outside |
| Autumn | Every seven to twelve days | Stretch it gradually as the light drops |
| Winter | Every two to three weeks | Water on a mild morning. Do not feed |
It is worth logging the date of every watering for one full year. Read back over it and you will see your own house's pattern, which is the only interval that actually applies to your plant.
What to do when you have got it wrong
Both mistakes are recoverable if you catch them early, and the treatment is different, so the diagnosis in the first section is worth getting right before you act.
- After a bad drought Stand the whole pot in a bucket of tepid water up to the rim for twenty minutes so the compost rewets all the way through, then drain it thoroughly. Dry compost repels water and pours it straight down the gap at the side of the pot, so top watering alone will not fix it. Move the plant out of bright light for a week while it recovers.
- After weeks of overwatering Stop watering, move it somewhere warmer and brighter, and let the pot dry down to the point where the top two inches are dry. If it has not improved in two weeks, turn it out. Healthy roots are firm and pale; rotten ones are brown, soft and come away when you pull. Cut those off, repot into fresh dry compost in a pot no larger than the remaining roots need, and water sparingly until new growth appears.
- If you see fungus gnats Small black flies running over the compost mean the surface has stayed wet too long. Let the top inch dry properly between waterings and they disappear on their own. They are a symptom of the watering, not a pest problem to spray.